In Situ X-ray Diffraction Study of Co鈥揂l Nanocomposites as Catalysts for Ammonia Decomposition

详细信息    查看全文

• 作者：Ying-Qiu Gu ; Xin-Pu Fu ; Pei-Pei Du ; Dong Gu ; Zhao Jin ; Yu-Ying Huang ; Rui Si ; Li-Qiang Zheng ; Qi-Sheng Song ; Chun-Jiang Jia ; Claudia Weidenthaler
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：July 30, 2015
• 年：2015
• 卷：119
• 期：30
• 页码：17102-17110
• 全文大小：685K
• ISSN：1932-7455

文摘

Co鈥揂l nanocomposite materials as active and stable catalysts for ammonia decomposition have been synthesized by a one-pot evaporation-induced self-assembly method. The catalysts were characterized by various techniques including powder X-ray diffraction (XRD), X-ray absorption fine structure (XAFS), X-ray photoelectron spectroscopy (XPS), N₂ adsorption/desorption, and transmission/scanning electron microscopy (TEM/SEM). Especially, in situ XRD under catalytic reaction conditions was performed, and metallic Co with a cubic structure was identified to be most probably the active crystalline phase for the decomposition of ammonia; also, contribution of CoO to the catalytic activity cannot be excluded. Most importantly, the introduction of alumina can significantly suppress the agglomeration of the active metallic Co phase and thus maintain the high activity of the cobalt catalyst.